J. Korean Math. Soc. 2005; 42(4): 749-759
Printed July 1, 2005
Copyright © The Korean Mathematical Society.
Youssef N. Raffoul
University of Dayton
We apply a cone theoretic fixed point theorem and obtain conditions for the existence of positive periodic solutions of the system of functional differential equations $$ x'(t) = A(t)x(t) + \lambda f(t, x(t-\tau(t)). $$
Keywords: cone theory, functional differential equations, positive periodic solution
MSC numbers: 34K13, 34B20
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